You did not include any following statements so i cannot answer
You start off by looking at which operation to do first. According to PMDAS (parentheses, multiplication, division, adding, and subtracting) you would do division first so
220-450/3
220-150
Then you complete the rest
220-150=70
Hopefully this helps! :)
You get a negative number
-3 + (-10) = -13
I assume there's a plus sign missing above...
Convert to polar coordinates, using
Then the Jacobian is
Then
so the integral can be written as
Let
, so that
.